Fort Worth daily gazette. (Fort Worth, Tex.) 1882-1891, 1887-02-21
POPULAR SCIENCE.
Recent Discoveries and Other Things I"
value to Many People.

carbonizing it. II is of clover-leaf shape.
is made Of manila hemp, and is car
! bombed by bath of mineral oil. The
ends of the thread are afterwards gal
vanized and soldered to platinum wires
which pass through the bulb; the ends
of these platinum wires are previously
turned spiral-like by means OF a very
simple machine; the electrolytic deposit
is q copper deposit and the soldering is
made with silver For obtaining o
vacuum they resort to Geisler mercury
pump. The vacuum is made in several
lamps at the ssme time generally seven !,
and they take care to render the threads
| incandescent, as usual, during the last
part of this operation. Their duration is
estimated at 1000 hours.
! Experienced wood workers have always
contended thst glue joint, properly done,
is stronger than the wood itself. And
yet joints often give way at the surface
where the glue is used, which is &C.
counted for by bad material. A similar
reason is frequently the true cause, which
few artisans wish to acknowledge. 1t is
merely that skill is lacking. In gluing
wood, it Is asserted by competent author
ity, bad work is produced by applying
glue to both surfaces. A good lob is Sc
cured by applying the glue hot, but lot
extremely so, to one surface, which
should be cold, while the other surface
should be heated at the stove, but should
have no glue upon it. By this method the
glue will permeate the wood and bind the
surface together more firmly than nature
binds the tibres.
Careful experiments on the serse of
smell in dogs have been made by George
j. Romans, who has communicated the
results to the Linnean Society of London.
| He finds that not only the feet but the
whole body Of man eXhales peculiar
or individual odor which dog can recOg-
nize as that of his master amidst crowd
of other persons; that the individual
quality Of this odOr can be recognized at
great distances to windward, or in calm
weather at great distance in any dlrec-
ton; and that even powerful perfumes
may not overcome this odOr. Yet sin
gle sheet of brown paper, when stepped
upon instead of the ground and afterward
removed, was sufficient to prevent Mr..
Romans dog from following his trail.
1t is now fairly established that the
common wart, which is so unsightly and
often proliferous ON the hands and face,
can be easily removed by small doses of
sulphate magnesia taken internally. NJ.
Colrat of Lyons, has drawn attention to
this extraordinary fact. Several children
treated with three grain doses of EPSON
salts, morning and evening, were prompt
IL cured. NJ. AubeTs cites the case of g.
woman whose face was disfgured by
these eXcrescences, and who was cured
in a month by dram and half OF mag
nesia taken daily. Another medical man
reports case of very large warts which
disappeared in fortnight from the daily
administration of ten grains OF :he salts.
Il The Medical Press.
An English device for preventing down
| draught in cnimneys consists of d number
of groO6ed rings of metal or clay placed
over each other with spaces between.
| The grooves are SO shaped that when the
wind strikes them it is detected upward,
thus efectually preventing any down
draught. An equally effective and simpler
plan for accomplishing that object is the
one suggested by A. J. Downing, namely,
bui, ding up with a single row Of brick at
the back of the fireplace to point few
inches above the top of the opening. The
wind, which in descending always follows
the surface of the outer wall of the flue,
strikes the Shelf thus formed, and is de-
fiected upward as in the other case. d.
Manufacturers of kerosene oil say that
all lamps are safe with good oil, and that
the quality of oil can De asCertained by
the following test: Take a pint lineup,
fill it nearly tull of water warmed so that
an ordinary thermometer immersed III il
will show l20', pour small quantity Of
oil on the water, stir it little, then pass
& lighted match quickly but closely over
the surface Of the oil once; if it ignites
the oil is unsafe. If purchases be made
of from three to five gallons at a time and
this test be made people can protect them
selves.
a boiler furnace i'll combination with a
CRATE. bridgewall and smoke chamber is q
newly patented invention. There is a
| pivotally suspended rear-plate, providing
the only communication TO the smoke
chamber from under the plate, which
latter is provided with 2 rod for swinging
it rearward. An air channel through
the base of the furnace communicates
with the gasduct through an opening di-
rectly below and opposite to the depend
ent plate, which channel is furnished
with valve to regulate the admission
| of air.
| For some time past, says Industry, gas
water has been applied directly to agri-
cultural land as fertile 7, with satisfac-
tory results. An average strength of
about 8 Tw. j. employed, aud at this
strength gallon of the water is equal
to about one pound of sulphate of am
MONA. The former will cost about IS.
per thirty-tive gallons. 1t is applied TO
the land from ssrrel by means of pipe
drilled with holes, just in the same way
/ as the streets of large towns are watered.
The quantity used is about 100 gallons
| per acre.
| In the extensive oyster, culture expert
ments of the United States government
particular attention is being given 10
methods for preserving the young. Wire
baskets three feet square and six inches
deep are used for collecting the spat,
which adhere closely to the sides aud
| bottom, this device enabling the operators
| to prevent the accumulation of mud, the
great foe of the oyster industry, by fire.
quent shakings of the baskets. An aver
age oyster is expected to yield 10000, 900
! young.
A new method OF securing veneer to its
| base consists IN spreading glue or other
adhesive matter between the veneer and
: -,